[latexrefman] Some @ignored French input to en.

[Vincent Belaïche]

Jim, in my latest commit to the en file, I made a number of clarifications.
I hope that you can review them : I came across the need for these
when aligning the corresponding fr node.

I also inserted some @ignored text from the fr for you to translate (I
did some texinfo escaping of the accent as you have this compilation
problem).

  V.